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JC GEOG
coastal processes and features
| Term | Definition |
|---|---|
| Hydraulic action | force and power of the water wears away the coastline |
| Abrasion | during storms loose rocks are thrown up by the waves against the coast |
| compressed air | as waves crash against cliffs air is trapped in cracks and compressed ,as water retreats escaping air explodes shattering rock |
| solution | soft rock dissolved by sea water eg limestone |
| features of sea erosion | bays and headlands ,sea cliffs, arch,stack,caveand blow hole |
| formation of a bay | areas of soft rock on the coastline are eroded faster than hard rock beside it forming a bay |
| headland | as soft rock is eroded the hard rock around it juts out to sea forms headlands |
| sea cliff | a steep sided high rock face on the coast |
| sea cave | long hollow tunnel in a cliff |
| sea arch | arch shaped opening in a headland example Old head of Kinsale Co Cork |
| sea stack | chunk of rock in the sea surrounded by water Cliffs of Moher co Clare |
| blow hole | a funnel shaped hole that joins a cave to the surface near a cliff edge eg Bridges of Ross Co Clare |
| longshore drift | movement of material along the shore |
| beach | an area of boulders sand and shingle which is found between high and low tide |
| sand spit | a ridge of sand and shingle which projects out to sea or across a bay eg Portmarnock Co Dublin |
| sand bar | a ridge of sand and shingle which projects out to sea or across a bay and cuts off the bay eg. Roonagh Lough Co Mayo |
| tombolo | a ridge of sand and shingle which projects out to sea or across a bay and joins an island to the mainland eg. Howth Co Dublin |
| backwash | the return of the water down the beach |
| advantages of the sea | recreation,fish catch,natural gas deposits, oil, |
| disadvantages of the sea | erosion of land ,housing and cliffs,flooding, sand clogging harbours |
| ways of protecting the coast | groynes,dykes and sea walls |